Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » hang tai, han tai, hinh tai
cau treo » cau theo, cau triet, cau trieu
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
duc van » duc va, duc tan, duc manh
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ly nang x hoi. hieu van lam duc van ((hanh tai) or (thanh tai)) ((cau treo) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang x hoi. hieu van lam duc van ((hanh tai) OR (thanh tai)) ((cau treo) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly nang x hoi. hieu van lam duc van ((hanh tai) or (thanh tai)) ((cau treo) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang x hoi. hieu van lam duc van ((hanh tai) or (thanh tai)) ((cau treo) OR (cau tren))*.