Perhaps you should try some spelling variations:
thien van » thi van
sach kem » hanh kem
nang doc » nang luc
doc hoi » duoc hoi, hoc hoi, doc hai
van cam » van nam, van lam, van cau
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach kem) or (sac ky)) nang doc hoi. thien van cam ((tuc va) or (tuc xa)) hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach kem) OR (sac ky)) nang doc hoi. thien van cam ((tuc va) OR (tuc xa)) hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: so ((sach kem) or (sac ky)) nang doc hoi. thien van cam ((tuc va) or (tuc xa)) hanh vi cua vat*.