Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
thai va » thai van
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
ve chat » van chat
mai hoi » mai khoi, dai hoi, lai hoi
va chat » van chat, va phat, cao chat
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
hai va » hai van, hoi va, mai va

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 y nang mai hoi. hieu ((ve chat) OR (va chat)) tuc va hanh ((hai va) or (thai va)) thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang mai hoi. hieu ((ve chat) OR (va chat)) tuc va hanh ((hai va) OR (thai va)) thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang mai hoi. hieu ((ve chat) OR (va chat)) tuc va hanh ((hai va) or (thai va)) thieu".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang mai hoi. hieu ((ve chat) OR (va chat)) tuc va hanh ((hai va) or (thai va)) thieu*.