Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
tinh dau » tinh da, trinh dan, trinh dao
thi nang » thi cong, ki nang, thi hanh
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, tuc xa, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. ((thien van) or (thi nang)) cham ((tuc va) OR (thuc va)) tinh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. ((thien van) OR (thi nang)) cham ((tuc va) OR (thuc va)) tinh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. ((thien van) or (thi nang)) cham ((tuc va) OR (thuc va)) tinh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. ((thien van) or (thi nang)) cham ((tuc va) OR (thuc va)) tinh dau cua tre*.