Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
lam cuu » lam chu, lam cua, cham cuu
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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 ly nang x hoi. ((hieu van) or (lieu va)) lam cuu van hanh ((di cua) OR (de cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang x hoi. ((hieu van) OR (lieu va)) lam cuu van hanh ((di cua) OR (de cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang x hoi. ((hieu van) or (lieu va)) lam cuu van hanh ((di cua) OR (de cua)) tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang x hoi. ((hieu van) or (lieu va)) lam cuu van hanh ((di cua) OR (de cua)) tu*.