Perhaps you should try some spelling variations:
thien van » thi van
vu sach » vu bach, su sach, vu khach
sach ho » sach hoi, sach ha, sach lo
ho nang » thi nang, kha nang, cao nang
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ca tren » cau tren, cu tren, la tren
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ho nang xa hoi. thien van cac tuc va hanh vi ((cua tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ho nang xa hoi. thien van cac tuc va hanh vi ((cua tre) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: vu sach ho nang xa hoi. thien van cac tuc va hanh vi ((cua tre) or (ca tren))*.