Perhaps you should try some spelling variations:
hanh vien » thanh vien, hanh kien, thanh nien
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
qua cau » quan cau, qua cac, qua ca
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach o lang xa hoi. hieu ((qua cau) or (cua cac)) ((truc va) or (thuc va)) hanh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach o lang xa hoi. hieu ((qua cau) OR (cua cac)) ((truc va) OR (thuc va)) hanh vien cac tro.
• Adding a wildcard symbol may retrieve word variants: su sach o lang xa hoi. hieu ((qua cau) or (cua cac)) ((truc va) or (thuc va)) hanh vien cac tro*.