Perhaps you should try some spelling variations:
lang mai » lang dai, lang hai, lang man
mai khoi » mai khoa, tai khoa, cac khoi
hoc sach » hoc sinh, hoc cac
hoc anh » hoc nganh, hoc nhanh, ngoc anh
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
van han » van hanh, van phan, van nhan
tai cuu » tai buu, tai cua, thai cua
y lang » o lang, _ lang, tay lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) OR (hoc anh)) y lang mai khoi. hieu qua cam duc van han ((tai cuu) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) y lang mai khoi. hieu qua cam duc van han ((tai cuu) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) y lang mai khoi. hieu qua cam duc van han ((tai cuu) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc anh)) y lang mai khoi. hieu qua cam duc van han ((tai cuu) or (tai cuc)) tre*.