Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
han tai » hang tai, nhan tai, van tai
van cau » van dau, van hau, van chat
phuc va » phuc vu, chuc va, thuc vat
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
cua te » cua tu
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: thuat sach ky nang x hoi. hieu van cau ((phuc va) or (thuc va)) han tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x hoi. hieu van cau ((phuc va) OR (thuc va)) han tai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang x hoi. hieu van cau ((phuc va) or (thuc va)) han tai ((dua tren) or (cua te))*.