Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
vien cac » vien bach, vien dai, vien da
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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 thieu nang ma hoi. hieu ((vien cac) or (va cam)) ((xac va) or (tuc va)) hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu nang ma hoi. hieu ((vien cac) OR (va cam)) ((xac va) OR (tuc va)) hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thieu nang ma hoi. hieu ((vien cac) or (va cam)) ((xac va) or (tuc va)) hanh vai cua triet*.