Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
hanh vai » hanh vi, hanh va, hanh tai
nang mai » nang ma, nang tai, lang mai
truc va » thuc va, thuc vat, trung va
sach ty » sach y, sach tu, sach thu
te sach » toc sach
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, tuc xa, duc va
vai va » mai va, dai va, hai va
luc va » duc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang mai hoi. hieu ve chat ((luc va) or (((tuc va) OR (truc va)))) hanh vai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang mai hoi. hieu ve chat ((luc va) OR (((tuc va) OR (truc va)))) hanh vai va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang mai hoi. hieu ve chat ((luc va) or (((tuc va) OR (truc va)))) hanh vai va thieu".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang mai hoi. hieu ve chat ((luc va) or (((tuc va) OR (truc va)))) hanh vai va thieu*.