Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cham truc » cau truc, nham thuc, nam truc
sach tay » xach tay, sach hay, sach nay
tay tang » tay lang, tay trung, tay quang
te sach » toc sach
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh li » nhanh li, hanh vi, han li
ca tren » cau tren, cu tren, la tren
li ca » ly ca

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 xa hoi. hieu va ((cham truc) OR (pham thuc)) va hanh li ca tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tay tang xa hoi. hieu va ((cham truc) OR (pham thuc)) va hanh li ca tren".
• Adding a wildcard symbol may retrieve word variants: te sach tay tang xa hoi. hieu va ((cham truc) OR (pham thuc)) va hanh li ca tren*.