Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
sach tay » xach tay, sach hay, sach nay
tay tang » tay lang, tay trung, tay quang
tang mai » tang ma, tang tai, lang mai
cham tuc » nham thuc, pham thuc, cham soc
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
vi cu » vi su, vi xu, vi du

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tay tang mai hoi. hieu va ((cham tuc) OR (tham thuc)) va hanh vi cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tay tang mai hoi. hieu va ((cham tuc) OR (tham thuc)) va hanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: te sach tay tang mai hoi. hieu va ((cham tuc) OR (tham thuc)) va hanh vi cu tren*.