Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
sai ky » sac ky
va cau » van cau, va cac, va dau
tai va » thai va, mai va, tri 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) or (sai ky)) nang xa hoi. hieu va cau truc va hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sai ky)) nang xa hoi. hieu va cau truc va hanh tai va triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sai ky)) nang xa hoi. hieu va cau truc va hanh tai va triet*.