Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
xa hanh » xa thanh, xa khanh, va hanh
lai cua » dai cua, hai cua, lai chau
y tang » ky tang, 6 tang, 5 tang
7 tang » 6 tang
ma hoi » mai hoi, xa hoi, ma hoa
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: thuoc sach ((y tang) OR (7 tang)) ma hoi. hieu van cam tuc xa hanh ((vi cua) or (lai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y tang) OR (7 tang)) ma hoi. hieu van cam tuc xa hanh ((vi cua) OR (lai cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y tang) OR (7 tang)) ma hoi. hieu van cam tuc xa hanh ((vi cua) or (lai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y tang) OR (7 tang)) ma hoi. hieu van cam tuc xa hanh ((vi cua) or (lai cua)) tu*.