Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cac ky) or (sach y)) nang xa hoi. hieu ve cac truc va hanh ((vai cua) OR (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cac ky) OR (sach y)) nang xa hoi. hieu ve cac truc va hanh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cac ky) or (sach y)) nang xa hoi. hieu ve cac truc va hanh ((vai cua) OR (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((cac ky) or (sach y)) nang xa hoi. hieu ve cac truc va hanh ((vai cua) OR (lai cua)) tre*.