Perhaps you should try some spelling variations:
trinh cuu » trinh cau, trinh cua, trinh chu
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
tri cuu » tri cua, tra cuu, troi cua
te sac » te sach, te cac, te san
loc va » hoc va, luc va
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ha hoi. hieu va cam ((tuc va) or (loc va)) hanh ((tri cuu) OR (trinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha hoi. hieu va cam ((tuc va) OR (loc va)) hanh ((tri cuu) OR (trinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ha hoi. hieu va cam ((tuc va) or (loc va)) hanh ((tri cuu) OR (trinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha hoi. hieu va cam ((tuc va) or (loc va)) hanh ((tri cuu) OR (trinh cuu)) tre*.