Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
chuan ted » chuan he
va trinh » van trinh, va tinh, lap trinh
pham duy » pham duc
ty nang » ky nang, ty xang, ty hang
bach ty » sach ty, xach tay, bach thu
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
chua tu » chu tu, cua tu, chua cu
duy va » duy vat, duy van, day va
ma hoi » mai hoi, xa hoi, ma hoa
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: vu bach ty nang ma hoi. hieu va pham duy va trinh toan ((((chuan ted) or (cua te))) or (chua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ty nang ma hoi. hieu va pham duy va trinh toan ((((chuan ted) OR (cua te))) OR (chua tu)).
• Adding a wildcard symbol may retrieve word variants: vu bach ty nang ma hoi. hieu va pham duy va trinh toan ((((chuan ted) or (cua te))) or (chua tu))*.