Perhaps you should try some spelling variations:
ngang duoc » nganh duoc, nhan duoc
tu ngang » tu ngan, hu angang, vu ngan
duoc hoi » quoc hoi, duoc hoc, duoc si
hieu van » hieu va, thien van, hieu ve
cau tren » cu tren, dau tren, cau treo
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
nam luc » nang luc, nhan luc, nam thuc
sach tu » sach thu, cach tu, sach ty
ca tren » cu tren, la tren, co tren
luc va » duc va, tuc 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: tu sach tu ngang duoc hoi. ((hieu van) or (lieu va)) nam luc va hanh va ((cau tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ngang duoc hoi. ((hieu van) OR (lieu va)) nam luc va hanh va ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ngang duoc hoi. ((hieu van) or (lieu va)) nam luc va hanh va ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ngang duoc hoi. ((hieu van) or (lieu va)) nam luc va hanh va ((cau tren) OR (ca tren))*.