Perhaps you should try some spelling variations:
hau treo » cau treo, cau theo, dau tren
thu sach » thuat sach, thuoc sach, thu hoach
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
hieu va » hieu qua
hai hau » hai chau, dai hau, hai hai
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
tu sach » su sach, te sach, tu cach
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: ((tu sach) OR (thu sach)) ly nang x hoi. ((lieu va) or (hieu va)) cam duc ban hanh hai hau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang x hoi. ((lieu va) OR (hieu va)) cam duc ban hanh hai hau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ly nang x hoi. ((lieu va) or (hieu va)) cam duc ban hanh hai hau treo".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ly nang x hoi. ((lieu va) or (hieu va)) cam duc ban hanh hai hau treo*.