Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc van » thuc vat, thuc dan, thuc va
nang ra » nang ma, lang ra, nang ro
sach ty » sach y, sach tu, sach thu
qua cac » cua cac
tuc van » truc van, tuc va, duc van
nang co » nang cao, nang doc, nang noi
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang co) or (nang ra)) hoi. hieu qua cac ((tuc van) or (thuc van)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang co) OR (nang ra)) hoi. hieu qua cac ((tuc van) OR (thuc van)) hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang co) or (nang ra)) hoi. hieu qua cac ((tuc van) or (thuc van)) hanh vi cua te*.